Today I was messing around and found out the tcs have a split plenum, My guess the valve closes at 4000rpm,

I have the switch to a toggle inside the cabin and I can manually close the valve. Didn't notice much torque loss but I noticed a smoother power gain.

In most cars I know that has this usually letting the valves close sooner increases power then if it opened at 4000rpm-

It being 4000 rpm I would assume was for mpg
Would anyone shed some more light on this subject.

I was hoping for a more aggressive sounding motor as well but I don't think its possible with oem intake.